310 CARNEGIE INSTITUTION OF WASHINGTON. 



The ports and dates of arrival indicate, in a general way, the portion of 

 the cruise from October 1920 to its conclusion: Lyttelton, New Zea- 

 land, October 21, 1920; Papeete, Tahiti, December 23, 1920; Fanning 

 Island, January 14, 1921; Laysan Island was passed at a distance less 

 than one mile on January 25; San Francisco, February 19; Honolulu, 

 April 12; stops of a few hours' duration for obtaining some food supplies 

 were made at Penrhyn Island, June 12, and at Manihiki Island on June 

 15 ; Pago Pago, Tutuila, June 20 ; Apia, Samoa, June 29 ; a brief stop was 

 made at Rarotonga, August 15, in order to land the ship's surgeon, who 

 was suffering from an infected arm; Balboa, Canal Zone, October 7; 

 Washington, November 10, 1921. The Director joined the Carnegie 

 at Balboa on October 12 and continued with her up to her arrival 

 at Washington. For further account of the cruise and the work ref- 

 erence must be made to pages 317-323. 



The aggregate length of the Carnegie's cruises, 1909-1921, is 

 253,220 nautical miles, or 291,595 statute miles, which, combined 

 with the cruises of the first vessel (the chartered Galilee, 1905-1908, 

 63,834 nautical miles), gives a total of our ocean cruises, August 1905 to 

 November 1921, of 317,054 nautical miles, or 365,103 statute miles, 

 which is nearly 15 times the Earth's circumference. Counting out the 

 times when the vessel was not in commission, on account of repairs 

 and of the Great War, more than a complete passage around the Earth 

 has been made for each 12 months of operation. 



Besides the magnetic work, the work in atmospheric electricity has 

 been regularly continued and important results have been obtained, 

 especially as pertains to the electric potential gradient of the atmos- 

 phere (see pp. 354-356. The additional observations made aboard the 

 Carnegie relate to atmospheric refraction, meteorology, hydrography, 

 and geography. Rock specimens have also been collected at ports of 

 call in cooperation with the Geophysical Laboratory for facilitating 

 Dr. Washington's investigations. 



LAND MAGNETICSURVEY WORK AND SPECIAL EXPEDITIONS. 



It has not yet been possible, because of expense and lack of person- 

 nel, to resume the land work with pre-war intensiveness. It would 

 seem necessary to place the Carnegie temporarily out of commission in 

 order that the requisite funds and observers for the land work may 

 become available. 



Mr. Frederick Brown carried out field work continuously throughout 

 the year; the general regions of the work were Eastern Africa and 

 Madagascar. A fairly detailed magnetic survey of Madagascar has 

 been completed, and Mr. Brown further obtained valuable data 

 regarding the secular changes in the Earth's magnetism. (For further 

 account of his work, see pp. 323-325.) 



In May 1921, Dr. H. M. W. Edmonds and Observer D. G. Coleman 

 were sent to Apia, Samoa, where they arrived about the middle of June. 



